That's way better uptake than the NFL's guardian caps,
View attachment 930588
A foam cap that fits over football helmets seemed to reduce the force of blows in lab experiments — but not on the field.
scopeblog.stanford.edu
realty versus fiction. Energy dissipation needs 2 things
1) a change in state
2) a loss in mass
F* (Delta T) = M * (Delta V) force (Or change in force) times the time it is acted on (change in time) = change in momentum or Mass x velocity (Changes in either)
F= M *DV/DT = M * A mass times acceleration. Newton's law
2) so, have something break off, and energy is dissipated.. The best example is Formula 1 cars. They are designed to disintegrate on impact, with each flying piece is energy lost.
1) change in state.. say a fluid sloshing, a gas compressing, a polymer deforming... TechPro barriers in F1.
While the Guardian Cap uses foam dimples, they are not large enough. And need to be 1-2" thick. And need to be of a polymer that can deform and stay deformed, and be thus used only once.
Guardian caps need to have an outer and inner shell, with dampeners in between. That is difficult.
A 1/4 to 1/2 inch hard foam will not absorb enough energy. Soft foam will collapse and be useless. Intermediate foam will work, but needs to be designed as I wrote.